further to this stuff, a ruby version:
class Array def group_seq reduce() do |acc, obj| if acc !=  && (yield obj) == (yield acc.last.first) acc.last << obj acc else acc << [obj] end end end end
The (yield obj) == (yield acc.last.first) will mean that things get grouped according to the value of the predicate. If you change the == to &&, then only values for which the predicate is true will be grouped.
It turns out that python already has this in it’s standard library, so that’s easy:
map(lambda (b,i): list(i), groupby([1,2,3,4,5,6,7,8], lambda n: n % 2 == 0))